I fast traveled to ArcJet Systems and once I spawned in there where two Deathclaws going real hard at each other. I've never seen something like this before, can anyone tell me why they were doing that?

Some animals in FO4 are scripted to be territorial. They'll attack anything in the area where they spawned including others of their own species. I often see enemies fighting one another in the wasteland, (last I saw was deathclaws vs mutants) but also the occasional deathclaw vs. deathclaw.

@"Waffenbaum" hey that's pretty neat, I didn't think Bethesda would be able to do anything like that but that's really cool.

I believe it's a scripted random event and not a territorial thing

Maybe the Deathclaw stole the mother Deathclaws Egg =/

The wasteland wasn't big enough for the two of them. A good ol' fashioned deathclaw rumble.

Reminds me of the classic doom games where enemies can begin to fight among themselves if they attack eachother.

@"rojok2" if only enemies in every game did that when they accidentally attacked each other.